Shear strength of normal strength concrete beams reinforced with deformed GFRP bars

This paper evaluates the shear strength, V-c, of intermediate length (2.5 rho (b), were tested with three replicate beams per design. All samples failed as a result of diagonal-tension shear. Measured shear strengths at failure are compared with theoretical predictions calculated according to tradit...

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Journal Title: Journal of Composites for Construction Vol. 5; no. 4; pp. 268 - 275
Authors: David Dinehart, S. P. Gross, J. R. Yost
Format: Article
Language: English
Published: RESTON, VA : ASCE-AMER SOC CIVIL ENGINEERS, 2001
NOV 2001
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Online Access: Full Text
Summary: This paper evaluates the shear strength, V-c, of intermediate length (2.5 rho (b), were tested with three replicate beams per design. All samples failed as a result of diagonal-tension shear. Measured shear strengths at failure are compared with theoretical predictions calculated according to traditional steel-reinforced concrete procedures and recently published expressions intended for beams reinforced with GFRP. Recommendations are made regarding the adequacy of shear strength prediction equations for GFRP-reinforced members. The study concludes that shear capacity is significantly overestimated by the "Building Code Requirements for Structural Concrete and Commentary" (ACI 318-99) expression for, V-c, as a result of the large crack widths, small compression block, and reduced dowel action in GFRP-reinforced flexural members. Shear strength was found to be independent of the amount of longitudinal GFRP reinforcement. A simplified empirical equation for predicting the ultimate shear strength of concrete beams reinforced with GFRP is endorsed.
ISSN: 1090-0268